- No events recorded for this year
- 1917대동 단결 선언
- 1919February. Inspired by the promotion of self-determination laid out in the Fourteen Points statement, Korean independence activists in Japan publish a February 8 Declaration of Independence. This directly inspires a similar act in Korea three weeks later.
- 1919Korean Declaration of Independence
- 1919Jeamni massacre
- 1919October. The kino-drama, Righteous Revenge, widely considered the first Korean film, premieres at Dansungsa. This marks the anniversary of the modern Korean Film Day, although whether it is truly the first Korean film has been disputed.
- 1919January. Gojong suddenly dies. He was and is still widely believed to have been poisoned by Japan [ko].
- 1919April. The Korean Provisional Government (KPG) is established in exile in Shanghai, and Syngman Rhee is elected its first leader.
- 1919February. The Muo Declaration of Independence [ko] is issued in Manchuria. It is the first such declaration of independence issued by Koreans, although its existence was then and remains relatively unknown.
- 1920Battle of Qingshanli
- 1920Battle of Fengwudong
- 1920April. The Shinhanchon Incident occurs, in which an estimated several hundred Koreans are massacred by the Japanese army in Vladivostok, Far Eastern Republic.
- 1920조선일보,동아일보가 창간됨
- 1920박은식이 한국독립운동지혈사(韓國獨立運動之血史)를 편찬, 회사령 철폐, 산미증식계획 실시, 진주 소년회
- 1920Battle of Samdunja
| - 1918 Shantou earthquake
- 魯迅發表小說《狂人日記》,抨击了中国古代“吃人”的封建思想。詩人蘇曼殊逝。中國科學社遷回國内,設在南京高師。汕头市发生7.2级大地震,1000人死亡。ZH
- 19161917 Nantou earthquakes
- 1916June — Yuan died.
- 19166月6日袁世凱病逝。黎元洪就任總統,段祺瑞任國務總理。10月31日黄兴病逝。
- 1917Manchu Restoration
- 1917November — History of the Chinese Communist Party: Bolsheviks led by Marxist leader Vladimir Lenin seized power in Russia in the October Revolution.
- 1917府院之爭,張勛拥护溥儀復辟失敗,孫中山廣州建大元帥府发动護法運動。吳稚暉編《國音字典》。毛澤東于長沙設新民學會。8月14日段祺瑞領導的北洋政府和中華民國第一屆國會通過了《對德宣戰案》,中華民國宣布对德意志帝國、奥匈帝國宣战,援助協约國。9月22日廣州國會非常會議承認對德宣戰案。
- 1919Treaty of Versailles
- 1919May Fourth Movement
- 1919五四運動。蔡元培辭去北京大學校長職。上海發起中國首次大規模罷工。中華革命黨改組為中國國民黨。北洋政府曹汝霖遭彈劾免職
- 1920Zhili–Anhui War
- 1920Gando Massacre
- 19201920 Hualien earthquake
- 1920爆發京國之爭,教育界做出以北京語音為標準音的決議,在學校推廣新國语。甘肃海原县发生8.5级大地震,是中国有地震记载中最高烈度地震之一,造成234,117到273,400人死亡。西北五马(马家军)联合自治。
| - Rice riots of 1918
- April — Japanese intervention in Siberia starts and continues until 1922.
- January 1918 to April 1920 — Spanish flu pandemic began to devastate Japan, which killed 400,000 people.
- 1917Lansing–Ishii Agreement
- 1917Kogyo Shoyuken Senji Ho, the Wartime Law on Industrial Property, is enacted.
- 1919March — March 1st Movement begins to invigorate the Korean independence movement.
- 1920Japan helps found the League of Nations.
| - President Wilson's Fourteen Points, which assures citizens that the Great War was being fought for a moral cause and postwar peace in Europe
- Daylight saving time is first adopted
- Spanish flu pandemic begins
- 1918 San Fermín earthquake
- Porvenir massacre
- Attack on Orleans
- Armistice agreement ends World War I
- Republicans win back Congress in the Midterm elections.
- 19161916 United States presidential election
- 1916Treaty of the Danish West Indies
- 1916the U.S. acquires Virgin Islands
- 1916Battle of Columbus
- 1916Jeannette Rankin first woman elected to U.S. congress
- 1916Louis Brandeis appointed to Supreme Court
- 1916Battle of Parral
- 1916Jones Act
- 1916The Great Migration begins
- 1916Germany agrees to restrict submarine warfare
- 1916Adamson Act
- 1916Federal Farm Loan Act
- 1917National Hockey League formed
- 1917Lansing–Ishii Agreement
- 19171920 – First Red Scare, marked by a widespread fear of Bolshevism and anarchism
- 19171919 – Silent Sentinels hold a vigil outside the White House gates in favor of women's suffrage, a nearly two–and–a–half year demonstration organized by Alice Paul and the National Woman's Party
- 1917U.S. Virgin Islands purchased from Denmark
- 1917U.S. enters World War I
- 1917Temperance movement leads to prohibition laws in 29 states
- 1917Zimmermann Telegram
- 1917March 4, 1917 – President Wilson and Vice President Marshall begin their second terms
- 1917Espionage and Sedition Acts
- 1919Treaty of Versailles
- 1919Great Molasses Flood
- 1919United States Senate rejects Treaty of Versailles and League of Nations
- 1919Black Sox Scandal
- 1919Sherwood Anderson publishes Winesburg, Ohio
- 1919President Wilson has a massive stroke. First Lady Edith Wilson takes over in a "silent coup".
- 191918th Amendment, establishing Prohibition
- 1919Palmer Raids
- 1920Sacco and Vanzetti arrested
- 1920National Football League is formed
- 19201920 U.S. presidential election: Warren G. Harding elected president, and Calvin Coolidge vice president.
- 1920Volstead Act
- 1920Battle of Matewan
- 1920The Great Steel Strike ends
- 1920First radio broadcasts, by KDKA in Pittsburgh and WWJ in Detroit
- 1920Economy collapses. The Depression of 1920–21 begins.
- 192019th Amendment, grants women the right to vote
- 1920March 4, 1921 – Harding becomes the 29th president and Coolidge becomes the 29th vice president
- 1920Esch–Cummins Act
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